100-4d=40

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Solution for 100-4d=40 equation: 


Simplifying
100 + -4d = 40

Solving
100 + -4d = 40

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '-100' to each side of the equation.
100 + -100 + -4d = 40 + -100

Combine like terms: 100 + -100 = 0
0 + -4d = 40 + -100
-4d = 40 + -100

Combine like terms: 40 + -100 = -60
-4d = -60

Divide each side by '-4'.
d = 15

Simplifying
d = 15

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